Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of August 10, 2026.
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John J Mast, MD

Individual provider Family Medicine Physician · NPI 1154392371

John J Mast, MD is a Geriatric Medicine in Elizabethtown, Pennsylvania. Graduated from Indiana University School of Medicine in 1996, 30 years ago. Practices with Lancaster General Hospital, a 518-clinician group and accepts Medicare assignment. Licensed in Pennsylvania.

Years since qualifying
30
Trained at
Indiana University School of Medicine
Licensed in
PA
In the registry since
2006
What do these letters mean?
MD — Doctor of Medicine
A physician who completed allopathic medical school.

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Practice location Address checks out

418 Cloverleaf Rd
Elizabethtown, PA 17022-9320
Phone: (717) 653-1467
Fax: (717) 653-1001
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Family Medicine Physician (primary) Taxonomy 207Q00000X · Licence MD066311L (PA)

Record details

NPI number1154392371
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorNo
NPI enumeratedJanuary 27, 2006
Last updated in NPPESOctober 25, 2007
Mailing address418 Cloverleaf Rd, Elizabethtown, PA 17022-9320

Medicare enrollment

From the CMS Doctors & Clinicians file — this clinician is enrolled in Medicare.

Medicare specialtyGERIATRIC MEDICINE
Also practisesFAMILY PRACTICE
Medical schoolINDIANA UNIVERSITY SCHOOL OF MEDICINE
Graduated 1996 (30 years in practice)
Group practice Lancaster General Hospital — 518 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount
Practice locations5 on file with Medicare

Other providers in Elizabethtown